Grommet



FIG. 1 is a front, top and side perspective view of the grommet showing my new design;

FIG. 2 is an elevational view thereof, all elevational views being identical;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a grommet, as shown and described. 